fix: use relative position on toolbar popover items (#774)

Blueprint's popover targetProps prop is ignored when rendering the target with `renderTarget`. Must use `children` prop instead.

Closes: #773

src/components/toolbar/Toolbar.tsx

@@ -274,9 +274,10 @@ Toolbar.PopoverItem = function ToolbarPopoverItem(
           height: 'fit-content',
         },
       }}
-      renderTarget={() => <Toolbar.Item isPopover {...itemProps} />}
       {...other}
-    />
+    >
+      <Toolbar.Item isPopover {...itemProps} />
+    </Popover>
   );
 };